Evaluation of the Microstructure and the Electrochemical Properties of Ce0.8(1?x)Gd0.2(1?x)CuxO[1.9(1?x)+x] Electrolytes for IT-SOFCs

Title
Evaluation of the Microstructure and the Electrochemical Properties of Ce0.8(1?x)Gd0.2(1?x)CuxO[1.9(1?x)+x] Electrolytes for IT-SOFCs
Authors
윤성필배재관그라지아 아카르도
Keywords
copper; sintering aid; gadolinium doped ceria; sol?gel combustion synthesis; SOFC
Issue Date
2020-07
Publisher
Applied Sciences-basel
Citation
VOL 10, NO 4573-13
Abstract
The influence of copper addition (0.5?2 mol%) on the crystal structure, densification microstructure, and electrochemical properties of Ce0.8Gd0.2O1.9 synthesized in a one-step sol?gel combustion synthesis route has been studied. It has been found that Cu is very active as sintering aids, with a significative reduction of GDC firing temperature. A reduction of 500 ?C with a small amount of copper (0.5 mol%) was observed achieving dense bodies with considerable ionic conductivities. Rietveld refined was used to investigate the crystal structure while relative density and microstructural examination were performed in the sintering temperature range of 1000?1200 ?C after dilatometer analysis. High dense bodies were fabricated at the lowest sintering temperature, which promotes the formation of Ce0.8(1?x)Gd0.2(1?x)CuxO[1.9(1?x)+x] solid solution and the absence of secondary phase Cu-rich or the segregation or copper at the grain boundary. As compared to the pure GDC an improvement of total conductivity was achieved with a maximum for the highest copper content of 2.23·10?3?9.19·10?2 S cm?1 in the temperature range of 200?800 ?C.
URI
http://pubs.kist.re.kr/handle/201004/72346
ISSN
2076-3417
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KIST Publication > Article
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